Combined lock and latch



Aug. 14, 1928.

K. ANDO COIBINED LOCK AND LATCH Filed June 23, 1927 2 Sheets-Sheet 1 W/w Mia ATTORNEYS.

Aug. 14, 1928.

1 1,680,930 K. ANDQ COMBINED LOCK AND LATCH File J n 2 1927 2 Sheets-Sheet 2 Fig;3- g

IINVENTOR. (/84 0 A TTORNEYJ:

Patented Aug. 14, 1928.

' UNITED STATES KATSUTABO ANDO, MIIWIMMIIKA'ISUElHIIKA-GUN', TOKYO-EU, JAPAN.

COMBINED LOCK AND LATCH.

Application filed J'une 23, 1927. Serial No. 201,003.

This invention relates to improvements in combined locks and latches, more particularly to those adapted to fit in a mortise in a door, and has for its object to provide a device of the class described in which the latching bolt" operated by the knob spindle may be latched in projected position emptyhanded without employing any key from the inside of the dOOIfSO vthat movement of the latching .bolt under the action of the knob spindle from the outside of the door will be prevented.

In the accom anying drawings:

Fi 1 is 'a ragmental longitudinal sectiona view of a door and door jamb having a lock constructed in accordance with my invention, the cover of the casing of the lock being removed to show the inner view. r Fig. 2 is a vertical sectional View therethrough.

Fig. 3 is an enlarged fragmental back view of a-escutcheon plate with attachment at the inner surface of the door partly broken away.

Fig. 4 is an enlarged fragmental vertical sectional view taken along line IVIV of Fig. 3.

Fig. 5 is an enlarged sectional view on line V-V of Fig. 3. l

Fig. 6 is an enlarged perspective view of a sector board and'latehing pin for showing their cooperative actions.

Referring to the drawings in detall, 1 represents a latching bolt and 2 represents a leg thereof. 4 and 5 are guides projected from a side wall of the casing of the lock, between which receive one end of the leg 2 of the latching bolt. Around the leg 2 between the guides 4, 5 and a head of the latching bolt are arranged a spiral spring 13 and collar 3 so that the latchlng bo to its rojected position. To an extremity of the eg 2 is fixed a L-shaped bar-7. The vertical arm of thebshaped bar 7 engages against one end of a pivoted lever 8 for retracting the latching bolt 1 from the opening formed in the door jamb under the action of the spindle of the knobs 9. The hor1- zontal arm of said L-shaped bar is formed,

at its end, with a lug 10 which is adapted to engage with latching means 11 under action of a key when desired to project the latching bolt into the lopening formed in the door jamb under the action of a key. The particulars of said latching means under action of a key are omitted herein as the same forms the knob spindle extends.

t is normally forced no part of the present invention. 17 represents a bushing for the knob bolt at the inner side of the door. Between the shoulder of said bushing and the escutcheon plate 18 1s lnserted an operating plate 20 substantlally of circular form with a peripheral projection on which a thumb piece 21 is at tached and a central opening through which 15 represents a sector board formed with twin sectors having a sloped side edge 16 respectively and is provided with a central opening through which the knob spindle extends. Said sector board is connected to the operating plate 20 thereagainst at the inner side ofthe escutcheon plate 18,'so that the sector board ma be turned under action of the operating plate, as clearly shown in Figs. 4 and 5. 25 is a latching pin of square cross section having a bolt with a washer 27 screwed to its outer end,'and is disposed to extend through a spring casing 22 attached to a rectangular plate 23 adjacent its one corner, the head of the bolt being projected through an opening formed in the rectangular. plate with the washer 27 against the brim of said opening and a spiral spring 26 surrounding the latching pin within the casing 22 and pressing against the washer 27, so that the latching pin is normally held in the retracted position casing 6 of the lock immediately behind the vertical arm of the L'-shaped bar 7.

In operation, when-it is desired to hold the latching bolt 1' against movement to retracted position under the action of the knob spindle, so that opening of the door from the outer side thereof will be prevented, the operating plate 20 is turned under action of the thumb "piece 21, thereby the sector board 15 to force out the latching in v25, the bolt head of the latching pin ing forced out against the spring 26 through the sloped edge 16, of the sector. In this mdvement of the operating plate, one end of the latching pin 25 is pro ected to the ath of movement of the L-s a ed bar 7 lirough the opening 14 at the side wall of the casing 6 to enga e with one side of the vertical arm of sai L-shaped bar, so that retracting movement of the latching bolt 1 is prevented under the action of the knob spindle. To relieve the latching bolt of the influence of the latching in 25 the operating plate is turned un er the action of the thumb piece 21 until the bolt head of the latching pin resumes a gap between the twin sectors of the sector board 15, so that the latching pin is Withdrawn from the path of movement of the L-shaped bar 7 under tension of the spring 26.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is In combination, a combined lock and latch adapted to fit in the mortise in a door and escutcheon plates secured to the opposite sides of thedoor, a bushing for the knob spindle in the inner side of the door, a latching bolt having an L-s haped bar fixed at one end of its leg, an operating plate with a thumb piece mounted on said bushin through its central openin and inter ose between a shoulder of said bushing an said escutcheon late, a sector board with twin sectors having a slo ed side ed e respectively mounted on said bushing t rough its central opening in the inner side of the escutcheon plate and connected to said oper ating plate by means of screws so that the same may be turned under action of said operating plate, a latching pin normally in its retracted position under tension of a spiral spring adapted to be forced out against the spring in engagement with said sector board and one side wall of the casin of said lock havin an opening formed therein, through whlch opening one end of said latching pin ma be extended to engage with an L-shape bar fixed at one end of the leg of said latchin bolt, so that the latching bolt may be he d against inward movement.

In testimony whereof I afiix my signature. I KATSUTARO ANDO. 

